import 'package:flutter/material.dart';

//Flutter 富文本
void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  late TabController tabController;

  //页面创建
  @override
  void initState() {
    super.initState();
    tabController = TabController(length: 8, vsync: this);

    tabController.addListener(() {
      print('listener debug');
      //是否正在滑动
      bool scroll = tabController.indexIsChanging;
      //
      int index = tabController.index;

      if (scroll) {
        print('正在滑动 $index');
      }

      if (!scroll) {
        print('滑动结束 $index');
        //
      }
    });
  }

  //页面销毁
  @override
  void dispose() {
    super.dispose();
    tabController.dispose();
  }

  @override
  Widget build(BuildContext context) {
    //脚手架
    return Scaffold(
      appBar: AppBar(
        title: Text('标题'),
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
        bottom: TabBar(
          controller: tabController,
          //是否可以滚动
          isScrollable: true,
          //指示器的颜色
          indicatorColor: Colors.yellow,
          //厚度
          indicatorWeight: 5,
          //内边距
          indicatorPadding: EdgeInsets.only(top: 0, bottom: 2),

          //自定义选中的装饰
          indicator: UnderlineTabIndicator(
            borderSide: BorderSide(color: Colors.red, width: 4),
            borderRadius: BorderRadius.circular(30),
          ),

          padding: EdgeInsets.only(left: 0, right: 0),
          tabAlignment: TabAlignment.center,
          indicatorSize: TabBarIndicatorSize.label,

          dividerHeight: 2,
          dividerColor: Colors.black,

          //选中的文字颜色
          labelColor: Colors.red,
          //所有的文字颜色  优先选中的
          labelStyle: TextStyle(fontSize: 18),
          labelPadding: EdgeInsets.only(left: 20, right: 20),

          //未选中 标签 的文本的颜色
          unselectedLabelColor: Colors.black87,
          //未选中 标签 的文本的样式
          unselectedLabelStyle: TextStyle(
            fontWeight: FontWeight.normal,
            fontSize: 16,
          ),

          tabs: [
            Tab(text: "标签1"),
            Tab(text: "标签2"),
            Tab(text: "标签3标签3"),
            Tab(text: "标签4"),
            Tab(text: "标签5"),
            Tab(text: "标签6"),
            Tab(text: "标签7"),
            Tab(text: "标签8"),
          ],
        ),
      ),
      body: TabBarView(
        controller: tabController,
        children: [
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本1'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本2'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本3'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本4'),
          ),

          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本5'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本6'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本7'),
          ),
          Container(
            width: 100,
            height: 100,
            color: Colors.orange,
            child: Text('文本8'),
          ),
        ],
      ),
      // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
